Staurolite and Zoisite Physical Properties

Staurolite

Zoisite

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Physical Properties

Tenacity

Brittle

Solubility

Durability

Specific Gravity

3.7-3.83.20-3.50

1 7.18

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Fracture

Subconchoidal, Conchoidal

Uneven, Conchoidal, Even

Cleavage

Distinct on {010}

Perfect {010} imperfect {100}

Mohs Hardness

7-7.56-7

2 10

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Chemical Composition

(Fe,Mg,Zn) 2Al 9(Si,Al) 4O 22(OH) 2Ulrich Henn and Claudio C.

Ca₂Al₃(SiO₄)₃(OH)

Staurolite and Zoisite Chemical Formula

While comparing Staurolite and Zoisite physical properties, the important data you should know is its chemical composition. Since chemical formula defines the molecular structure of the crystal, most of the physical properties like color, tenacity, solubility are governed by Staurolite and Zoisite chemical formula.

Chemical formula of Staurolite- (Fe,Mg,Zn) 2Al 9(Si,Al) 4O 22(OH) 2Ulrich Henn and Claudio C.
Chemical formula of Zoisite- Ca₂Al₃(SiO₄)₃(OH)

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Staurolite and Zoisite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Staurolite and Zoisite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Staurolite and Zoisite Optical Properties during the identification of gemstone. Specific gravity of Staurolite is 3.20-3.50 whereas that of Zoisite is 3.20-3.50.